Insulator-pin.



J. G. S. & A. P. LINDHOLM.

. INSU LATOR PIN,

APPLICATION FILED NOV. 2, 19M.

Patented Feb. 8, 1916.

2 SHEETS-SHEET I.

[fave/fin J Lind/$06120 STATES PATENT OFFICE.

JOHN G. lL'I'MFEiULM AND ANDRES 3?. LINIDHOLM, OF CHICAGO, ILLINOIS; $5.113 JOHN,

3, L'ZNDHOLM ASSIGN'GE TO SAID ANDERS P, LINDHGLFL INSULAIGR-PIN,

Specification of Letters latent.

Patented Feb. 8 1916.

To alien/tom gin-sworn.

Be it known Trill) We, JOHN G. S. 11131)- HOLM and interns P. Lnsonomr, citizensmf the United States, residing at Chicago, in and State oif lllinois, have in"? new and useful 1m movements 1 litisulator-Pins, of which the following is .1 specification.

Our inyenti slates to improvements in insulator snp orts, commonly known as cross arm and has for its general ob- 'le an insulator pin that is resilient isits coeperatioirwith the trangible insul or (usually glass) that may be readily e to its support by an ordincry bcl rise; and that cheap, simple, iinra end easy of manufacture .3; wherein We have illuslflQillillfillllg our invention, full disclosure, Figure 1' showing an insulator se s through the internm and anchorage structure i invention. Fi 2 and 3 of the y perspective views the pin. I Fig. l is a VlBW similar to Fig 1 showing; a modified em "i the invention; Figs 5 andti ails showi dili'erent applications the Fig. -lstructure.

In the d wing A indicates a telegraphpole cross n or other suitable support,

end ll an insu ator well known type to be such insulator usually be mounted thereon ing made, as shown, of glass with an internal tapered thread Z), Refer ins; first to the form shown in 1. to 3 C represents the pin and D a bolt securing said pin to the arm A. The pin shown consists of two members and separable on a vertical plane. Each said member constitutes a shell forming, roughly speaking, half of the pin structure and each provides a threaded stem portion 7, a body portion. 8 and a base portion complement-ill to the similar parts of the other member so that jointly the two members constitute a hollow pin-shell disided vertical plane traversing the longitudinal axis throughout the side walls of the pin, and having double-thickness or interlanpcl boss.

Vlhile a pin embodying our invention may be made by or otherwise, We prefer that the structure be stamped or drawrrof sheet metal, and in contour the erts hare been designed with this end in View, the enumerated portions of each section merging one into the other in curves that facilitate metal drawing operation, and preserve the metal unruptured. The tapering hollow stem 7 is formed with a pressed thread for cooperation with the threaded insulator B; the body portion 8 is preferably swelled iiito pear-shape to give a relatively extensive bearing at its lower end, and the base portions 9 are preferably circular in shape, so that each section has a base of substantially the full-base area. Thus, save, for an in significant variation of contour due to the overlapping of the bases of the two members they substantially symmetrical, T he overlapping bases of the two members are apertured for the reception of the bolt D, the apertures being preferably rectangular so as to coope "ate with the squared throat -03 of usual carriage bolt form. Speci cally We prefer that the square aperture 10 i the inner base member lDO'fUIHlQCl by striking out ears 11 that are bent downwardly and that may be sharpened at their lower ed es to form penetrating lugs, the aperture i0 in the base of the outer section 5 being sufiicietly enlarged to acconimoclat these lugs which 3, eject below the plane of the base seat so that they may penetrate some what into the Wood of the cross arm A as shown in Manifestly these parts be made to inter-lit neatly so that when the members are assembled and the bolt D is tightened the two shell sections are-so snugly assembled at their bases and their contacting edges contiguous to the bases that the bottom portion of the assembled structure very rigid strong It Will be observed that the doubling of the base thickness, and the interlocking or the two base portions, by means of the lugs 11 gives to the structure adequate strength to resist distortion of the base by strain imposed through the tightening of the bolt D.

F or best embodiment of our invention the stem structure 7 should have its two sections normally separated at their adjacent edges as indicated at 1", that when the base structure is firmly and rigidly positioned' our preference, means to attaining this resiliency of the stem structure that the contiguous slllc edges of the base sections be so formed that, when the assemblage and 111' choragxe is (,'()l'lll ')lllli(.l, they may contact intiinatcly through a portion of their vertical extent to a pointai'ljacent that marked 1% in Fig. 1, and that the formation of the upper iortions of the body partsfi and stem part shall, before the insulator is applied, throw them son'lewluit farther apart than is illustrated in Fig. l, that when the tapercil insulator is screwed on the thread to the position shown in Fig. l, the two upper portions ,of the sections are under some ten- Finn, springing, as it were, on the point id as a fulcrum. in. this fashion the insulatorrecciving threaded portion of the structure has such resilient ulaptability to the insulator that at all times it holds said insulator against rattling and comes and goes un der expans on and contraction due to heat and cold, so that there is no liability to fractiu'e of the insulator. lhis protection .of the insulator against fracture isfurthered by the formation of the thread in sheet-metal of uniform thickness, as the metallic threads then'iselves are, in av measure, resilient.

in practical construction we prefer that the metal parts be all of non-rusting materizl l or suitably galvanized or otherwise prepared to resist rust, and in order to permit the escape of any moisture that may enter or condense within the metal shed a drain opening 19 is preferably provided at a low point in one, or each, of the shell members.

In the installation of an insulator pin of the structure shown in Fig. 1, it will be obvious that the two shell members may be assembled on the belt and the bolt then passed through the aperture in the arm-i l,

- and it will be observed that should diili the lugs culty be me; in inserting the bolt, through the arm, {as is often the case in practice) the open-top shell formation of the insulator or. i suitable rod or punch to be placed izi head, of the bolt D and hammered to drive the bolt home, without in any Wa main-eating the shell. also that the lugs ll, biting into the wood (generally lengthwise of the grain), adequately prevent the pin and its bolt from turning, and if'a carriage bolt with a suiliciently short squared threat be employed no counter-sink in the Wood need be made, the mere tension on the bolt serving to force 11 into the wood fiber.

it will be apparent to those skilled in the art that many of the features of our invention susceptible to mechanical modifi cation without departure from the spirit of our ini'ention, and We have shown in Figs. 4 to 8 a modified structure embodying feature; of our invention. This, however, without intent to limit the invention to the ext will be observed nit/nine cmplifications of our ideas herein shown, but as indicating that mechanical variations may be effected in many particulars within the spirit of thc'invention.

The half-shells 5' and 6, (Fig. l) may be gcnerall y similar to those shown in Fig. l", but the fulcrum effect that gives desired resiliency to the pin-stem may be otherwise secured. For instance in Fig. l, the walls of the sections are inwardly bossed, as'at l, and, preferably secured together as by a boil; or rivet 17, making the structure less dependent for its resiliency on the close interfitting' of the base parts.

In lieu of the bolt D, or supplementing a suitable bolt, the shell-bases 9 may have integral extensions 19 in the form of halftubes, adapted to extend down through the aperture of the cross arm, these tube-halves preferably being apertured as at 20 at different points in their length and having, preferably, lugs 21 at their bottoms, adapted easily to be upset. The holding of the halftubes in a. suitable cross-arm hole, and the abutmentof bosses l l gi e the desired pinresiliency, but preferably the interlapping' of the bases of the pin sections, and the interengagement through lugs, are features additionally employed. Thus, on both sides of the tube-half, each base extends in its horizontal plane. and the ends of the crotched base of the inner shell-member 6' may have downturned cars 11 to extend tl'lrough openings 10 in the opposite'b'ase member. Also, if desired, the tubular struc ture may be used as a sleeve for a smaller bolt D, so that. the use of the pin structure is not confined to cross arms as shallow as the length of the sleeve, as shown in Fig. 7.

It will be observed with respect to Fig,

8, the tube halves may, on occasion be spread apart and flattened as desired, for nailing of the structure to a roof-peah or othersupport.

()lzher variations in specific embodiment may, of course, be made within the scope of the appended claims.

Having described our invention, what we claim. is

1. The combination, in a structure of the character described, of two vertical sections each providing a threaded insulator-engaging portion, and each having a horizontal ase portion, and means for securing said base portions together and to a support.

2. In an insulator, the combination of two hollow-shell sections jointly providing an exteriorly threaded stem divided on a vertical plane and seating base, and means to connect the base portions of the pin together and to a support, the edges of the threaded portion of the pin being separated for lateral resiliency.

3. A sheet D'Kllllll'lIlSLlllltOl' pin comprising two approximately similar sections, forin l t o o, sl

iullic irml or pin cozni n'ieinp; two Vertical section: jmnily l fill'iili hollow shell hovinn l innitlate engaging n1cans,soil ,$(,Ul;l()l|h lXEYiilI ovo :1 UELi hose portions, one Said lniee'porun lmving an aperture and the oihor liming ports interlock with said HPHMH' .3. in it down-o of the character describe-:1 iho combination. of two sections each providing: 1a peripher threaded portion, and a horizontal bars portion, said base portions moi-looping and having registering apertm'e. Hi a, bolt taking through said aperhires to ecure Enid base structures together and to 21 support;

o. in :1 structure or the character dewri'ocrl the combination of two hollow, seciionnl shell-members jointiy providing ape--- rioherai structure having threaded taper n, and a pear shaped body, said EM'URlJPE'S having horizontal. base portions, n means; for securing said members tollior and to a support.

T. in n z-itructnre of the character cl a'ilworl ti combination of two hollow, sew onal ii-nicznbors jointly providing a pc omen strnoture having a threaded taperand a pear shaped body, said vonihe wiring overlapping base portions,

lt 'u: of bllltl sections having a drain aperture wow its; Ems-w and. rooms for securing said winners togo her and to a support.

o. in structure of the character dea nihmi illl; roinbination of two shcetnneta-l lwll-zscrt? each providing it substantially viznsinr ll/Sii, the one adapted. to overlie the idler, lw having" apertures therein i :weiro vertical bolt, the confronting sectional, metallic insulr or oin C613? p "iicni sections liming o v mopping, hon base portions :ipertureci to re (#cive n vertical bolt.

10. A sectionui, metallic insult-bio pin coin prioing vcrticei sections having overlapping,

horizontal base portions aperture/(i. to re; (rive :rverticel bolt, one base portion having lugs interfi ting in an aperture of the other base portion 11. A section zil, metallic insulator pin coin- 'ising vertical sections havingoverlapping, horizontal. oose portions apertured to receive or vertical bolt, edge portions of the aperture in one liaise portion projecting through the aperture in the other to form protruding anchoragelugs. 12. The combination or 11 support having an aperture, an insulator pin comprising two verticoi shell sections having opertnrecl bases, a bolttaiiing through said apertures, and into the pin-shell, securing said sections together and to the support, said pin sootions beingprovided. with tapered external threads near the top,:1nd resiiiently separated, and n taper-threaded insulatorscrewed on said pin holding said sections i'iormaily under tension.

13. In an insuiator pin, the combination 1? two vertical sections adopted for connoction with a support, each said section comprising a hoilow half-shell of: sheet metal externally threaded, the contiguous edges of said hzil'f-shells separated throughout their upper portion and meeting at their lower portions, and each providing a subetantiolly horizontalbase-part,

In testimony whereof we hereunto set our 

